<!DOCTYPE html>
<html lang="en">
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    <meta charset="UTF-8" />
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    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      /**
    for (var i = 0; i< 10; i++){
      setTimeout(() => {
        console.log(i);
        }, 1000)
    }
    */
      // 方式1
      // for (let i = 0; i < 10; i++) {
      //   setTimeout(() => {
      //     console.log(i);
      //   }, 1000);
      // }

      // 方式2
      for (let i = 0; i < 10; i++) {
        (function (i) {
          setTimeout(() => {
            console.log(i);
          }, 1000);
        })(i);
      }

      var b = 10;
      (function () {
        console.log(b);
      })();
    </script>
  </body>
</html>
